There's a difference between having a fantasy and actually writing a book about a child and a teacher having a romantic relationship...
First , this is not a story about a teacher and child having romantic relationship. The fact that you thought the taller guy was a teacher clearly shows that you haven't even read the story.
Second, this is a totally normal story about a child having a crush on a person relatively older than him and shows that he's immature and dosen't understand what's wrong with it .
At some point they older guy realises the severity of the situation and decides to distance himself from the kid, but that only frustrates the kid as he doesn't understand these things as a child so they have a proper talk about it and they make up
Later the kid's friend introduces him to erotic stuff and being a teen he fantasies about the older guy in a sexual manner and that seems to trigger a lot of people here
But the thing is , I don't see anything wrong with it , it's totally normal for a child to be immature or not understand complicated situations or have erotic thoughts when they are going through puberty
These things actually do happen in real life and there is no person in blame. These things are not talked about or represented in media enough because people tend to see it in bad lighting just like here,
half of the people here are commenting how this is pedo and relationship between child and adult is bad.
They are totally ignoring the fact that this isn't even romance , all I've seen till now is the kid has an unethical crush and all his friends support him while the other party rejects him
The snowflakes going wild in the comments, calm down bro's going through puberty, even I used to fantasie shit about by teacher when I was a teen lmaoo. You know what would've been fucked? The adult having sexual fantasies about that kid , not the other way around